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Date:   Sun, 12 Mar 2023 14:57:53 +0100
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Subject: Re: [PATCH 5.15 000/567] 5.15.99-rc1 review
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To:     =?UTF-8?Q?Daniel_D=c3=adaz?= <daniel.diaz@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org
Cc:     patches@lists.linux.dev, linux-kernel@vger.kernel.org,
        torvalds@linux-foundation.org, akpm@linux-foundation.org,
        linux@roeck-us.net, shuah@kernel.org, patches@kernelci.org,
        lkft-triage@lists.linaro.org, pavel@denx.de, jonathanh@nvidia.com,
        f.fainelli@gmail.com, sudipm.mukherjee@gmail.com,
        srw@sladewatkins.net, rwarsow@gmx.de, peterz@infradead.org,
        jpoimboe@redhat.com, ray@n5lax.com
References: <20230307165905.838066027@linuxfoundation.org>
 <4ce8fe57-53eb-4a83-a468-ebfc98fed496@linaro.org>
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@leemhuis.info>
In-Reply-To: <4ce8fe57-53eb-4a83-a468-ebfc98fed496@linaro.org>
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On 08.03.23 07:24, Daniel Díaz wrote:
> 
> On 07/03/23 10:55, Greg Kroah-Hartman wrote:
>> This is the start of the stable review cycle for the 5.15.99 release.
>> There are 567 patches in this series, all will be posted as a response
>> to this one.  If anyone has any issues with these being applied, please
>> let me know.
>>
>> Responses should be made by Thu, 09 Mar 2023 16:57:34 +0000.
>> Anything received after that time might be too late.
>>
>> The whole patch series can be found in one patch at:
>>     https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.15.99-rc1.gz
>> or in the git tree and branch at:
>>     git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y
>> and the diffstat can be found below.
> 
> A new warning has been introduced on x86_64; we've seen it with GCC 8,
> 11, 12, and Clang 16.
> 
>   arch/x86/kernel/smp.o: warning: objtool: sysvec_reboot()+0x54:
> unreachable instruction
> 
> Bisection pointed towards "x86: Mark stop_this_cpu() __noreturn"
> (upstream commit f9cdf7ca57cada055f61ef6d0eb4db21c3f200db). Reverting
> this commit did remove the warning.
> 
> Reproducer:
> 
>   tuxmake \
>     --runtime podman \
>     --target-arch x86_64 \
>     --toolchain gcc-11 \
>     --kconfig
> https://storage.tuxsuite.com/public/linaro/lkft/builds/2MhGKYH63pYIllJIDAxH3FsvakK/config

FWIW, thee is another report about it here:
https://bugzilla.kernel.org/show_bug.cgi?id=217175
CCing the reporter

This is definitely not my area of expertise, so you might better want to
ignore the the following: I did some quick searching and now wonder if
backporting be0075951fde ("x86: Annotate call_on_stack()") might fix the
warning; it already was backported to 5.15 afaics:
https://lore.kernel.org/all/20220412062945.857488242@linuxfoundation.org/

Ciao, Thorsten